Method of making glassware.



F. w.1s,wAm. METHOD 0F MAKING GLASSWARE.

FIG. A1.

:NVENTOR fg/fmt lll UNITED STATES PATENT OFFICE FREDERICK W. SEWART, F BEAVER, PENNSYLVANIA; ASSIGNOR 0F ONE-HALF T() PHOENIX GLASS COMPANY, 0F PITTSBURGH, PENNSYLVANIA, A CRPORATIN 0F WEST VIRGINIA.,

annexion or MAKING eLAsswAnE.

Application e lune 20, 1916.

-sind useful Improvement in Methods 1 Making Glassware; and lf do Ihereby declare: the following to be a full, clear, and exact description thereof. .c

My invention'yrelates to method of mel;- infihellow articles of glassware, and morey especially to articles having both ends openly: such as globes or shades.

in vtbe method new usually employed blowing such articles, tbe blank is irsl; pressed in fr mold which forms tbe upper on xneck portion. 'lVitli tbe openended upperY or neel; portion sind with the inner 'end closed, this blank is removed from the' pressing mold and inserted in the blow mold .whereupon air is admitted'to blow the glass ont to conform to the shape of the mold. The varticle when removed from tbe blovwT mold is Closed at it liner end, tbe glass having been blown-*to an even thickness throughout the article. This inner end por tion is then crooked off and the inner end ground *to even or smooth up tbeedge. The cracking o of this closed end portion Where the glass is of the some thickness throughv'r.. out- ;is often attended with diflieulties, and' in cracking oil, the. Whole globe or shade may be destroyed.

"be object olflrny invention is to provide a method whereby the closed innerend or portion to be cracked ofi' is of thinner glass than the main body ol tbe nrc'icle so that tbe cracking el? con be donetvery readily et this rliinned portion without Meeting tbe main body of the article.

My improved mclllod consists, generally stated, in introducing the pressed open top blank into the blew mold supporting the inner end of the blank on the bottom of the mold, introducing a gaseous fluid to blow the glass out to conform to the mold, thinning the glass at the lower end brggfond ille end of the finished article, whereby when the article is removed :froml the mold who closed end portion to be cracked off may: be readily 'separated from the mainportionlo the article leaving the rough edge tobe nished in any suitable manner. l In the accompanying drawings, I hay illustrated the 'steps of-my improved method,

Specification uf Letters Patent..

*. erticle removed from the blow-mold; Fig.

designates a suitable'blow mold adapted to with the blank extending@ down into the 4blow mold and resting on libe raised cenral Patented Mar. 12, 19H5.

seriai nu. 194,668.

in which Figure 1 shows the blank.. snp ported in the blow-mold ready for tbe blownog operation; F ig. 2 shows the article blown wilhin the blow-mold. Fig. 3 shows the showstbe article crooked olf; and Fig. 5 shows the article in the process of grinding oil its rough edge. y

Referring to tbe drawings, the numeral 2 support the neck ring 3 in the usual mann "l-vner, sfid neck ring baring been removed Afrom the mold in which the blank l was pressed, and placed upon the-blow mold bottom .portion 5 of the blow mold. This raised. bottom-portion 5 has the concave sent 6 in which the inner end of the blank rests and an annuler recess 7 being formed around this raised central 'portion 5.

Then the blank has been arranged in the blow-mold in tbe manner indicated'in Fig. l, air is admitted to the blank through e. suitable blow-pipe 8 and tbe blank is expanded so es lo conform to 'thesbape of the blow mold cavity, 'which in ,this ense is shaped to form a gloss globe or shade.

The admission of the nir in this manner blows the glass ont egainstthe wells of the 8 a-b where the finished article itself ends,

and'rom which point tbe glass formingl tbe closed linner end portion is 'to be cracked oil.

`Wben the article, has been blown in this manner and removed from the blowmold,

it has the appearance indicatedin Fig. 3, 10o

the glass beyond the line a-b being con siderably thinner than the main body of the globe.

. In order to separate `ibis portion from the main bodye the globe, the operator takes an instrument and byinse'rting it within the globe and tapping on the closed end portion, the glass at the thinned por'ion breaks sway and separates, as indicated in Fig;v e. This leaves the rough edge portion llo 5l, which ground off or plyng th@ glmbe in the n the ordinary manner. l

By my inventnn., l.'y provide :1 very slmpl@ and elcenr, method of pruvldl'xg for the removal G35 le closad end portion uf the article, or by thinning tlm glad; the paint described, lle sepamlfm of the lclosed and portion is eected wtllrmi: fliliculty and without danger of breaking or marring the main body of the VVlmt I' claim is:

L Ilw megvthbd of forming articles Gf gill] \vnre"m`vmg openings at @zum and the v of wnsiSng-f in ntrndw, g a presd (rl) tmp blank im@ blow' nmd supperting inner end. @f said blank al; fl poimtfrasd abve the hmmm of the rmld cfwll'y, imm during gaseous m blow {Alle} glass 1mi to conform 'm the mold 'ky hinning 'il glassyat the lower end lsayfmd l ha and nf the hmsherl, armenia remarqua? im whale removed by 51;@ gzrrmalmg storm l@ mamme .from he l'mmd edge.

2. T151@ metlmd nl? blowing' articles of glassware l'mvng openings mold, and cracking it of at the pox-1011 and nlshmg the rough I 'm5 leach end thereof consisting in introducing a pressed opewtop blank 'While `laat nlu a blow-mold, Cchilling Ehe 'inner end of said article, infn ducing gaseous fluid t'o blow the glass out to conform to the moldswityv, thinning the glass at ille inner and beyond the /end of the fnislmd article, removing th@ article from the mold, cracking ii; @if 4ai: the thinned porrnn amd .finishing the rough ed e.

In eslmmy Wl'lereof, lf the said FRED MICKEY: SrEWM-rra have hereunto Se#J my hand,

lREERCl 'W1 STEWART. Wis'tmesseg: 

